in reply to perl -e ';' -MCGI

It's a minor savings but I do find myself typing this kind of thing a fair amount (I have a couple versions aliases too) so I suggest it-

perl -MCGI -e1

There are other useful switches for testing. See the switches section in perlrun for enough options to make your head explode.

moo@cow>perl -MCGI -we'print' Use of uninitialized value in print at -e line 1.